1. What is PSI to GPM Conversion?

Definition: This calculator converts pressure difference (PSI) to flow rate (GPM) using fluid dynamics principles.

Purpose: It helps engineers and technicians determine fluid flow rates in pipes and systems based on pressure measurements.

2. How Does the Calculator Work?

The calculator uses these formulas:

Where:

• \( V \) — Fluid velocity (ft/s)
• \( P_1 \) — Initial pressure (psi)
• \( P_2 \) — Final pressure (psi)
• \( \rho \) — Fluid density (lb/ft³)
• \( Q \) — Flow rate (GPM)
• \( A \) — Cross-sectional area (ft²)

Explanation: The pressure difference is converted to velocity, which is then multiplied by area and a conversion factor to get flow rate.

3. Importance of PSI to GPM Conversion

Details: Accurate flow rate calculations are essential for system design, pump sizing, and troubleshooting fluid systems.

4. Using the Calculator

Tips: Enter the pressure values, fluid density (default 62.4 lb/ft³ for water), and pipe area. All values must be > 0 except P₂ which can be 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is there a 144 in the formula?
A: This converts psi (lb/in²) to lb/ft² (1 ft² = 144 in²).

Q2: What's the 448.83 conversion factor?
A: This converts ft³/s to gallons per minute (1 ft³/s = 448.83 GPM).

Q3: What density should I use for other fluids?
A: Use 49.2 lb/ft³ for gasoline, 78.6 lb/ft³ for seawater, or look up your specific fluid's density.

Q4: How do I find the cross-sectional area?
A: For circular pipes: \( A = \pi \times (diameter/2)^2 \).

Q5: Does this account for friction losses?
A: No, this is the theoretical maximum flow. Actual flow will be less due to friction and other losses.